Efficient Quantum Photonic Phase Shift in a Low Q-Factor Regime

Petros Androvitsaneas, Andrew Young, Joseph Lennon, Schneider C., S. Maier, J. J Hinchcliff, George Atkinson, Edmund Harbord, M. Kamp, S. Hofling, John Rarity, Ruth Oulton

Research output: Contribution to journalArticle (Academic Journal)peer-review

16 Citations (Scopus)
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Solid-state quantum emitters have long been recognized as the ideal platform to realize integrated quantum photonic technologies. We demonstrate that a self-assembled negatively charged quantum dot (QD) in a low Q-factor photonic micropillar is a suitable design for deterministic polarization switching and spin-photon entanglement. We show this by measuring a shift in phase of an input single photon of at least 2π/3. As we explain in the text, this is strong experimental proof that input photons can interact with the emitter deterministically. A deterministic photon-emitter interaction is a viable and scalable means to achieve several vital functionalities such as single photon switches and entanglement gates. Our experimentally determined value is limited by mode mismatch between the input laser and the cavity, QD spectral fluctuations, and spin relaxation. When on-resonance we estimate that up to ∼80% of the collected photons couple into the cavity mode and have interacted with the QD and undergone a phase shift of π.
Original languageEnglish
Pages (from-to)429-435
Number of pages7
JournalACS Photonics
Issue number2
Early online date11 Jan 2019
Publication statusPublished - 20 Feb 2019

Structured keywords

  • Bristol Quantum Information Institute
  • QETLabs
  • Photonics and Quantum


  • quantum dot
  • cavity QED
  • micropillar cavity


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    Oulton, R.


    Project: Research

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